A [world title] match has that feeling much more strongly because it's the same guy doing it over and over and over … When you play a single person, it becomes narrower because you are so focused on each other. It is a lot more personal.
When you lose, you really feel a sense of self … You actually feel that you are being taken apart, rather than just your pieces.
Age is part of it. For instance, I recognise that [Carlsen] is going to do certain things because he's 22 and there are certain things I can do because I'm 43.
Being the undisputed world champion is a relief. We instituted a unified chess title, I am the absolute world champion.